Diagnostic Medical Sonography (DMS) Practice Exam

Two waves can have identical PRF's, even if their frequencies are different.

False Not true Always true True

Correct Answer:

True

Explanation:

Pulse repetition frequency is the number of pulses sent per second, not the frequency of the ultrasound wave itself. PRF is determined by how long echoes take to return from the farthest imaging depth and by the listening time after each pulse. Because this timing depends on depth and pulse timing, not on the carrier frequency of the transmitted wave, you can have waves with different frequencies being pulsed at the same rate. A high-frequency wave and a low-frequency wave can both be emitted at the same PRF, while their carrier frequencies—affecting resolution and attenuation—remain different.

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